Geology Map of the Larsemann Hills 2004

The Larsemann Hills region is dominated by two major lithological associations, a Palaeoproterozoic felsic/mafic orthogneiss complex (Sostrene Orthogneiss) which occurs as basement to a sequence of pelitic, psammitic and felsic paragneiss (supergroup = Brattstrand Paragneiss) and felsic intrusives....

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Bibliographic Details
Other Authors: CARSON, CHRISTOPHER (hasPrincipalInvestigator), CARSON, CHRISTOPHER (processor), GREW, EDWARD (hasPrincipalInvestigator), Australian Antarctic Data Centre (publisher)
Format: Dataset
Language:unknown
Published: Australian Antarctic Data Centre
Subjects:
geoscientificInformation
TECTONIC LANDFORMS
EARTH SCIENCE
SOLID EARTH
GEOMORPHIC LANDFORMS/PROCESSES
METAMORPHIC ROCKS
ROCKS/MINERALS/CRYSTALS
Larsemann Hills
Geology
GIS
Map
VISUAL OBSERVATIONS
AERIAL PHOTOGRAPHS
CONTINENT &gt
ANTARCTICA &gt
GEOGRAPHIC REGION &gt
POLAR
Sostrene
Antarc*
Antarctica
Online Access:https://researchdata.ands.org.au/geology-map-larsemann-hills-2004/701238
https://doi.org/10.26179/5beba1b8ddecd
https://data.aad.gov.au/metadata/records/lars_geology_2004
http://nla.gov.au/nla.party-617536
Description
Summary:The Larsemann Hills region is dominated by two major lithological associations, a Palaeoproterozoic felsic/mafic orthogneiss complex (Sostrene Orthogneiss) which occurs as basement to a sequence of pelitic, psammitic and felsic paragneiss (supergroup = Brattstrand Paragneiss) and felsic intrusives. The depositional age of the Brattstrand Paragneiss sequences are controversial but isotopic data suggest derivation from the basement Sostrene Orthogneiss. Current geochronology indicates that the region experienced medium to low pressure granulite-facies metamorphism during the Early Palaeozoic (~500 Ma). Although the paragneiss sequences record no evidence of earlier metamorphism, relicts of a previous metamorphic event at ~1000 Ma are preserved in the Sostrene Orthogneiss. Within the Larsemann Hills region, the Early Palaeozoic event is characterised by peak metamorphism of ~7 kbar at ~800-850 degrees C, with the post-peak evolution characterised by decompression, with some cooling, to 4 kbars at 750 degrees C, then to 2-3 kbar at 600-650 degrees C during final stages of orogenesis, with exhumation largely driven by crustal extension. Tectonic models generally argue for a continental-continental collisional scenario, with thermal input derived from a thinned mantle lithosphere. See the document available for download at the provided URL for further information.

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